Liquid crystal display device

A liquid crystal display device having a liquid crystal layer formed by irradiating and curing with ultraviolet rays a liquid crystal composition comprising a liquid crystal and a polymerizable compound disposed between a pair of substrates provided with electrodes, and at least one of the substrates being provided with a liquid crystal alignment film to vertically align a liquid crystal, wherein

• said liquid crystal composition comprises a compound represented by the following formula [1], and said liquid crystal alignment film is obtained from a liquid crystal alignment treating agent comprising a polymer having a side chain structure represented by the following formula [2-1] or formula [2-2], and a side chain structure represented by the following formula [3]:
• X1—X2—X3—X4—X5—X6X7pX8 [1]
• wherein X1 is at least one selected from the group consisting of the following formula [1-a] to formula [1-g], X2 is at least one bond group selected from the group consisting of a single bond, —O—, —NH—, —N(CH3)—, —CH2O—, —CONH—, —NHCO—, —CON(CH3)—, —N(CH3)CO—, —COO— and —OCO—, X3 is a single bond or —(CH2)a— wherein a is an integer of from 1 to 15, X4 is at least one bond group selected from the group consisting of a single bond, —O—, —OCH2—, —COO— and —OCO—, X5 is a benzene ring, a cyclohexane ring or a C17-51 divalent organic group having a steroid skeleton, wherein any optional hydrogen atom on the benzene ring or the cyclohexane ring may be substituted by a C1-3 alkyl group, a C1-3 alkoxy group, a C1-3 fluorinated alkyl group, a C1-3 fluorinated alkoxy group or a fluorine atom, X6 is at least one bond group selected from the group consisting of a single bond, —O—, —OCH2—, —CH2O—, —COO— and —OCO—, X7 is a benzene ring or a cyclohexane ring, wherein any optional hydrogen atom on the cyclic group may be substituted by a C1-3 alkyl group, a C1-3 alkoxy group, a C1-3 fluorinated alkyl group, a C1-3 fluorinated alkoxy group or a fluorine atom, p is an integer of from 0 to 4, and X8 is at least one selected from the group consisting of a C1-18 alkyl group, a C1-18 fluorinated alkyl group, a C1-18 alkoxy group and a C1-18 fluorinated alkoxy group,
• wherein XA is a hydrogen atom or a benzene ring, XB is at least one cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic ring, and XC is at least one selected from the group consisting of a C1-18 alkyl group, a C1-18 fluorinated alkyl group, a C1-18 alkoxy group and a C1-18 fluorinated alkoxy group,
• —Y1—Y2—Y3—Y4Y5nY6 [2-1]
• wherein Y1 and Y3 are each independently at least one bond group selected from the group consisting of a single bond, —(CH2)a— wherein a is an integer of from 1 to 15, —O—, —CH2O—, —COO— and —OCO—, Y2 is a single bond or —(CH2)b— wherein b is an integer of from 1 to 15, Y4 and Y5 are each independently at least one divalent cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic ring, or a C17-51 divalent organic group having a steroid skeleton, wherein any optional hydrogen atom on the cyclic group may be substituted by a C1-3 alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy group, or a fluorine atom, n is an integer of from 0 to 4, and Y6 is a C1-18 alkyl, fluorinated alkyl, alkoxy or fluorinated alkoxy group,
• —Y7—Y8 [2-2]
• wherein Y7 is at least one bond group selected from the group consisting of a single bond, —O—, —CH2O—, —CONH—, —NHCO—, —CON(CH3)—, —N(CH3)CO—, —COO— and —OCO—, and Y8 is a C8-22 alkyl group or a C6-18 fluorinated alkyl group,
• —W1—W2—W3—W4 [3]
• wherein W1 and W3 are each independently at least one bond group selected from the group consisting of a single bond, —O—, —NH—, —N(CH3)—, —CH2O—, —CONH—, —NHCO—, —CON(CH3)—, —N(CH3)CO—, —COO— and —OCO—, W2 is a single bond, a C1-18 alkylene group or a C6-24 organic group having at least one cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic ring, wherein any optional hydrogen atom on the cyclic group may be substituted by a C1-3 alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy group, and W4 is at least one structure selected from the group consisting of the following formula [3-a] to formula [3-g]:
• wherein WA is a hydrogen atom or a benzene ring, WB is at least one cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic group, and WC is a C1-18 alkyl, fluorinated alkyl, alkoxy or fluorinated alkoxy group;
• and
• wherein the liquid crystal display device is in a transparent state when no voltage is applied and in a scattering state when a voltage is applied.